问题
选择题
The importance of saving gas ______ be stressed too much. Automobiles use up some 70 billion gallons of gas a year.[ ]
A. mustn’t
B. cannot
C. shouldn’t
D. may not
答案
答案：B
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The importance of saving gas ______ be stressed too much. Automobiles use up some 70 billion gallons of gas a year.[ ]
A. mustn’t
B. cannot
C. shouldn’t
D. may not
答案：B